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Автор - zarinka1299

решите уравнение:
1) х²-8х-84=0
2) 7х²-20х+14=0

решите пожалуйста

Ответ

Автор - samadovtimur
1)D=64+336=400
x1=8+20/2=14
x2=8-20/2=-6
2)D=400-392=8
x1=20+√8/2
x2=20-√8/2

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